<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form id="form" action="/HibernateBBSAlpha/msgServlet?opt=send" method="post">
<input type="text" name="msg" />
<input type="submit" value="send" />  
</form>

<script type="text/javascript">
window.onload=function(){
	document.getElementById("form").onsubmit=function(){
		var form = document.getElementById("form");
		var msg = form.msg.value;
		
		if (msg == "" || msg == null) {
			return false;
		} else {
			return true;
		}
	};
};
</script>
</body>
</html>